[mips] Fix atomic compare exchange

The input load from the memory has redundant bits, so it
needs to be extracted with an offset;
But the input of InputRegister does not need the offset.

Change-Id: Iea6e9bce981ca8a2d1ee55b10a5c5ff3c205357f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2881383Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Auto-Submit: Liu yu <liuyu@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#74454}

src/compiler/backend/mips/code-generator-mips.cc

@@ -494,8 +494,8 @@ void EmitWordLoadPoisoningIfNeeded(CodeGenerator* codegen,
     __ Ll(i.TempRegister(2), MemOperand(i.TempRegister(0), 0));                \
     __ ExtractBits(i.OutputRegister(0), i.TempRegister(2), i.TempRegister(1),  \
                    size, sign_extend);                                         \
-    __ ExtractBits(i.InputRegister(2), i.InputRegister(2), i.TempRegister(1),  \
-                   size, sign_extend);                                         \
+    __ ExtractBits(i.InputRegister(2), i.InputRegister(2), zero_reg, size,     \
+                   sign_extend);                                               \
     __ BranchShort(&exit, ne, i.InputRegister(2),                              \
                    Operand(i.OutputRegister(0)));                              \
     __ InsertBits(i.TempRegister(2), i.InputRegister(3), i.TempRegister(1),    \

src/compiler/backend/mips64/code-generator-mips64.cc

@@ -465,8 +465,8 @@ void EmitWordLoadPoisoningIfNeeded(CodeGenerator* codegen,
     __ load_linked(i.TempRegister(2), MemOperand(i.TempRegister(0), 0));       \
     __ ExtractBits(i.OutputRegister(0), i.TempRegister(2), i.TempRegister(1),  \
                    size, sign_extend);                                         \
-    __ ExtractBits(i.InputRegister(2), i.InputRegister(2), i.TempRegister(1),  \
-                   size, sign_extend);                                         \
+    __ ExtractBits(i.InputRegister(2), i.InputRegister(2), zero_reg, size,     \
+                   sign_extend);                                               \
     __ BranchShort(&exit, ne, i.InputRegister(2),                              \
                    Operand(i.OutputRegister(0)));                              \
     __ InsertBits(i.TempRegister(2), i.InputRegister(3), i.TempRegister(1),    \