X87: Make disassembler string tables read-only.

port r24672.

original commit message:

  Move them from .data to .rodata.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/654263006

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24710 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x87/disasm-x87.cc

@@ -1698,17 +1698,17 @@ int DisassemblerX87::InstructionDecode(v8::internal::Vector<char> out_buffer,
 //------------------------------------------------------------------------------
 
 
-static const char* cpu_regs[8] = {
+static const char* const cpu_regs[8] = {
   "eax", "ecx", "edx", "ebx", "esp", "ebp", "esi", "edi"
 };
 
 
-static const char* byte_cpu_regs[8] = {
+static const char* const byte_cpu_regs[8] = {
   "al", "cl", "dl", "bl", "ah", "ch", "dh", "bh"
 };
 
 
-static const char* xmm_regs[8] = {
+static const char* const xmm_regs[8] = {
   "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7"
 };