gdb, gdbserver, gdbsupport: trim trailing whitespaces

I noticed my IDE (VSCode) starting to automatically trim trailing
whitespaces on save, despite the setting for it being disabled.  I
realized that this is because the .editorconfig file now has

    trim_trailing_whitespace = true

for many file types.  If we have this EditorConfig setting forcing
editors to trim trailing whitespaces, I think it would make sense to
clean up trailing whitespaces from our files.  Otherwise, people will
always get spurious whitespace changes when editing these files.

I did a mass cleanup using this command:

$ find gdb gdbserver gdbsupport -type f \( \
    -name "*.c" -o \
    -name "*.h" -o \
    -name "*.cc" -o \
    -name "*.texi" -o \
    -name "*.exp" -o \
    -name "*.tcl" -o \
    -name "*.py" -o \
    -name "*.s" -o \
    -name "*.S" -o \
    -name "*.asm" -o \
    -name "*.awk" -o \
    -name "*.ac" -o \
    -name "Makefile*" -o \
    -name "*.sh" -o \
    -name "*.adb" -o \
    -name "*.ads" -o \
    -name "*.d" -o \
    -name "*.go" -o \
    -name "*.F90" -o \
    -name "*.f90" \
\) -exec sed -ri 's/[ \t]+$//' {} +

I then did an autotools regen, because we don't actually want to change
the Makefile and Makefile.in files that are generated.

Change-Id: I6f91b83e3b8c4dc7d5d51a2ebf60706120efe691

gdbserver/gdbthread.h

@@ -87,7 +87,7 @@ struct thread_info : public intrusive_list_node<thread_info>
 
   /* Thread options GDB requested with QThreadOptions.  */
   gdb_thread_options thread_options = 0;
-  
+
 private:
   process_info *m_process;
   std::unique_ptr<struct regcache> m_regcache = nullptr;

gdbserver/i387-fp.cc

@@ -336,7 +336,7 @@ i387_cache_to_xsave (struct regcache *regcache, void *buf)
     {
       int xmm0_regnum = find_regno (regcache->tdesc, "xmm0");
 
-      for (i = 0; i < num_xmm_registers; i++) 
+      for (i = 0; i < num_xmm_registers; i++)
 	{
 	  collect_register (regcache, i + xmm0_regnum, raw);
 	  p = fp->xmm_space + i * 16;
@@ -353,7 +353,7 @@ i387_cache_to_xsave (struct regcache *regcache, void *buf)
     {
       int ymm0h_regnum = find_regno (regcache->tdesc, "ymm0h");
 
-      for (i = 0; i < num_xmm_registers; i++) 
+      for (i = 0; i < num_xmm_registers; i++)
 	{
 	  collect_register (regcache, i + ymm0h_regnum, raw);
 	  p = fp->ymmh_space () + i * 16;

gdbserver/linux-i386-ipa.cc

@@ -131,7 +131,7 @@ initialize_fast_tracepoint_trampoline_buffer (void)
   FILE *f = fopen ("/proc/sys/vm/mmap_min_addr", "r");
 
   if (!f)
-    {    
+    {
       snprintf (buf, sizeof (buf), "mmap_min_addr open failed: %s",
 		safe_strerror (errno));
       set_trampoline_buffer_space (0, 0, buf);
@@ -140,9 +140,9 @@ initialize_fast_tracepoint_trampoline_buffer (void)
 
   if (fgets (buf, IPA_BUFSIZ, f))
     sscanf (buf, "%llu", &mmap_min_addr);
-      
+
   fclose (f);
-      
+
   buffer_size = buffer_end - mmap_min_addr;
 
   if (buffer_size >= min_buffer_size)

gdbserver/linux-low.h

@@ -562,7 +562,7 @@ private:
   process_info *add_linux_process_no_mem_file (int pid, int attached);
 
   /* Free resources associated to PROC and remove it.  */
-  void remove_linux_process (process_info *proc); 
+  void remove_linux_process (process_info *proc);
 
   /* Add a new thread.  */
   lwp_info *add_lwp (ptid_t ptid);

gdbserver/linux-x86-low.cc

@@ -211,7 +211,7 @@ struct arch_process_info
 /* Mapping between the general-purpose registers in `struct user'
    format and GDB's register array layout.
    Note that the transfer layout uses 64-bit regs.  */
-static /*const*/ int i386_regmap[] = 
+static /*const*/ int i386_regmap[] =
 {
   RAX * 8, RCX * 8, RDX * 8, RBX * 8,
   RSP * 8, RBP * 8, RSI * 8, RDI * 8,
@@ -264,7 +264,7 @@ static const int x86_64_regmap[] =
 
 /* Mapping between the general-purpose registers in `struct user'
    format and GDB's register array layout.  */
-static /*const*/ int i386_regmap[] = 
+static /*const*/ int i386_regmap[] =
 {
   EAX * 4, ECX * 4, EDX * 4, EBX * 4,
   UESP * 4, EBP * 4, ESI * 4, EDI * 4,

gdbserver/server.h

@@ -130,7 +130,7 @@ extern unsigned long signal_pid;
 struct client_state
 {
   client_state ():
-    own_buf ((char *) xmalloc (PBUFSIZ + 1)) 
+    own_buf ((char *) xmalloc (PBUFSIZ + 1))
   {}
 
   /* The thread set with an `Hc' packet.  `Hc' is deprecated in favor of

gdbserver/tracepoint.cc

@@ -2850,7 +2850,7 @@ have_fast_tracepoint_trampoline_buffer (char *buf)
     {
       internal_error ("error extracting trampoline_buffer_end");
     }
-  
+
   if (buf)
     {
       buf[0] = '\0';