Reviewers: paul.l..., balazs.kilvady, akos.palfi.imgtec,

Description:
MIPS64: Fix bogus assert in AddI.

TEST=
BUG=

Please review this at https://codereview.chromium.org/1170173002/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+1, -1 lines):
  M 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 4ca54d6a2bb32cb37ad01653fe0a4294559ebf03..66dc709c591b08feb60842643d74a0078f9bfcc0 100644
--- a/src/mips64/lithium-codegen-mips64.cc
+++ b/src/mips64/lithium-codegen-mips64.cc
@@ -1907,7 +1907,7 @@ void LCodeGen::DoAddI(LAddI* instr) {
   bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);

   if (!can_overflow) {
-    DCHECK(right->IsRegister());
+    DCHECK(right->IsRegister() || right->IsConstantOperand());
     __ Daddu(ToRegister(result), ToRegister(left), ToOperand(right));
   } else {  // can_overflow.
     Register overflow = scratch0();


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