MIPS: Fix reg use in SIMD.js Add the other SIMD Phase 1 types.

src/mips64/lithium-codegen-mips64.cc

Index: src/mips64/lithium-codegen-mips64.cc
diff --git a/src/mips64/lithium-codegen-mips64.cc b/src/mips64/lithium-codegen-mips64.cc
index fe8ee01eeef3962b4da293c22960615f8cf741ba..b676fad4da89b4671aece620ff6d210c04781ec8 100644
--- a/src/mips64/lithium-codegen-mips64.cc
+++ b/src/mips64/lithium-codegen-mips64.cc
@@ -2287,7 +2287,7 @@ void LCodeGen::DoBranch(LBranch* instr) {
         Label not_simd;
         const Register scratch = scratch1();
         __ lbu(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
-        __ Branch(&not_simd, lt, at, Operand(FIRST_SIMD_VALUE_TYPE));
+        __ Branch(&not_simd, lt, scratch, Operand(FIRST_SIMD_VALUE_TYPE));
         __ Branch(instr->TrueLabel(chunk_), le, scratch,
                   Operand(LAST_SIMD_VALUE_TYPE));
         __ bind(&not_simd);