Make ARM RegNames[] static like X86 (no ARM syms in X86-only build).

src/IceTargetLoweringMIPS32.cpp

Index: src/IceTargetLoweringMIPS32.cpp
diff --git a/src/IceTargetLoweringMIPS32.cpp b/src/IceTargetLoweringMIPS32.cpp
index a7e85a8f7c76dfe7dba1e40ebc4489b52af35dae..add97b36dd8abcae2d278ed6e015442ee380b2d1 100644
--- a/src/IceTargetLoweringMIPS32.cpp
+++ b/src/IceTargetLoweringMIPS32.cpp
@@ -220,17 +220,16 @@ bool TargetMIPS32::doBranchOpt(Inst *I, const CfgNode *NextNode) {
   return false;
 }
 
-IceString TargetMIPS32::RegNames[] = {
+IceString TargetMIPS32::getRegName(SizeT RegNum, Type Ty) const {
+  assert(RegNum < RegMIPS32::Reg_NUM);
+  (void)Ty;
+  static const char *RegNames[] = {
 #define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
           isFP)                                                                \
   name,
-    REGMIPS32_TABLE
+      REGMIPS32_TABLE
 #undef X
-};
-
-IceString TargetMIPS32::getRegName(SizeT RegNum, Type Ty) const {
-  assert(RegNum < RegMIPS32::Reg_NUM);
-  (void)Ty;
+  };
   return RegNames[RegNum];
 }