Add vfp support on ARM. Patch from John Jozwiak.

src/arm/constants-arm.cc

Index: src/arm/constants-arm.cc
===================================================================
--- src/arm/constants-arm.cc	(revision 3208)
+++ src/arm/constants-arm.cc	(working copy)
@@ -66,7 +66,29 @@
   return result;
 }
 
+// Support for VFP registers s0 to s31 (d0 to d15).
+// Note that "sN:sM" is the same as "dN/2"
+// These register names are defined in a way to match the native disassembler
+// formatting. See for example the command "objdump -d <binary file>".
+const char* VFPRegisters::names_[kNumVFPRegisters] = {
+    "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
+    "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15",
+    "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
+    "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
+    "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
+    "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15",
+};
 
+const char* VFPRegisters::Name(int reg) {
+  const char* result;
+  if ((0 <= reg) && (reg < kNumVFPRegisters)) {
+    result = names_[reg];
+  } else {
+    result = "no_vfp_reg";
+  }
+  return result;
+}
+
 int Registers::Number(const char* name) {
   // Look through the canonical names.
   for (int i = 0; i < kNumRegisters; i++) {