MIPS: Fix `[builtins] Introduce further constant & external reference indirections`

Temporary register at was rewritten. We use different register.

Change-Id: If3a162765ee29eb1d03d3f29345328cf79244e41
Reviewed-on: https://chromium-review.googlesource.com/1032616Reviewed-by: Sreten Kovacevic <sreten.kovacevic@mips.com>
Commit-Queue: Sreten Kovacevic <sreten.kovacevic@mips.com>
Cr-Commit-Position: refs/heads/master@{#52843}

src/mips/macro-assembler-mips.cc

@@ -3782,10 +3782,8 @@ void TurboAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode,
   DCHECK(RelocInfo::IsCodeTarget(rmode));
 #ifdef V8_EMBEDDED_BUILTINS
   if (root_array_available_ && isolate()->ShouldLoadConstantsFromRootList()) {
-    UseScratchRegisterScope temps(this);
-    Register scratch = temps.Acquire();
-    LookupConstant(scratch, code);
-    Jump(scratch, Code::kHeaderSize - kHeapObjectTag, cond, rs, rt, bd);
+    LookupConstant(t9, code);
+    Jump(t9, Code::kHeaderSize - kHeapObjectTag, cond, rs, rt, bd);
     return;
   }
 #endif  // V8_EMBEDDED_BUILTINS
@@ -3942,10 +3940,8 @@ void TurboAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode,
   BlockTrampolinePoolScope block_trampoline_pool(this);
 #ifdef V8_EMBEDDED_BUILTINS
   if (root_array_available_ && isolate()->ShouldLoadConstantsFromRootList()) {
-    UseScratchRegisterScope temps(this);
-    Register scratch = temps.Acquire();
-    LookupConstant(scratch, code);
-    Call(scratch, Code::kHeaderSize - kHeapObjectTag, cond, rs, rt, bd);
+    LookupConstant(t9, code);
+    Call(t9, Code::kHeaderSize - kHeapObjectTag, cond, rs, rt, bd);
     return;
   }
 #endif  // V8_EMBEDDED_BUILTINS

src/mips64/macro-assembler-mips64.cc

@@ -4212,11 +4212,9 @@ void TurboAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode,
   DCHECK(RelocInfo::IsCodeTarget(rmode));
 #ifdef V8_EMBEDDED_BUILTINS
   if (root_array_available_ && isolate()->ShouldLoadConstantsFromRootList()) {
-    UseScratchRegisterScope temps(this);
-    Register scratch = temps.Acquire();
-    LookupConstant(scratch, code);
-    Daddu(scratch, scratch, Operand(Code::kHeaderSize - kHeapObjectTag));
-    Jump(scratch, cond, rs, rt, bd);
+    LookupConstant(t9, code);
+    Daddu(t9, t9, Operand(Code::kHeaderSize - kHeapObjectTag));
+    Jump(t9, cond, rs, rt, bd);
     return;
   }
 #endif  // V8_EMBEDDED_BUILTINS
@@ -4305,11 +4303,9 @@ void TurboAssembler::Call(Handle<Code> code, RelocInfo::Mode rmode,
   BlockTrampolinePoolScope block_trampoline_pool(this);
 #ifdef V8_EMBEDDED_BUILTINS
   if (root_array_available_ && isolate()->ShouldLoadConstantsFromRootList()) {
-    UseScratchRegisterScope temps(this);
-    Register scratch = temps.Acquire();
-    LookupConstant(scratch, code);
-    Daddu(scratch, scratch, Operand(Code::kHeaderSize - kHeapObjectTag));
-    Call(scratch, cond, rs, rt, bd);
+    LookupConstant(t9, code);
+    Daddu(t9, t9, Operand(Code::kHeaderSize - kHeapObjectTag));
+    Call(t9, cond, rs, rt, bd);
     return;
   }
 #endif  // V8_EMBEDDED_BUILTINS