ARM: Fix GC bug with previous change

The change in r4990 contained a bug in Math.pow. One of the arguments for the call to runtime where clobbered if allocation of the heap number for the result failed.

Caught by a couple of Mozilla tests which does a lot of calls to Math.pow.

Fix presubmit error in x64.
Review URL: http://codereview.chromium.org/2847037

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4993 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/codegen-arm.cc

@@ -4402,8 +4402,10 @@ void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
     __ vsqrt(d0, d0);
 
     __ bind(&allocate_return);
-    __ AllocateHeapNumberWithValue(
-        base, d0, scratch1, scratch2, heap_number_map, runtime.entry_label());
+    Register scratch3 = r5;
+    __ AllocateHeapNumberWithValue(scratch3, d0, scratch1, scratch2,
+                                   heap_number_map, runtime.entry_label());
+    __ mov(base, scratch3);
     done.Jump();
 
     runtime.Bind();

src/x64/codegen-x64.cc

@@ -9113,7 +9113,8 @@ void CompareStub::Generate(MacroAssembler* masm) {
 
   __ bind(&check_for_strings);
 
-  __ JumpIfNotBothSequentialAsciiStrings(rdx, rax, rcx, rbx, &check_unequal_objects);
+  __ JumpIfNotBothSequentialAsciiStrings(
+      rdx, rax, rcx, rbx, &check_unequal_objects);
 
   // Inline comparison of ascii strings.
   StringCompareStub::GenerateCompareFlatAsciiStrings(masm,