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

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 88adcd421769ccd5f448e5ba7ee66abd8f928e90..37fa97d2ecc81e3dbf5bd9949ac4aef27073cea4 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -2186,7 +2186,7 @@ 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);