[mips][wasm-c-api] Fix offset when calling WasmCapiFunction

In WasmCapiCallWrappers, the address is passed in a register instead
of as an immediate, so we reduced 3 instructions to load the address
to t9;

before: lui + ori + dsll + ori;
after: mov;

Port: 54d84cf3

Bug: v8:11774
Change-Id: I423e54216ff65f1c12128c2b26443e1838b68003
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2914771
Auto-Submit: Liu yu <liuyu@loongson.cn>
Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#74720}

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

@@ -778,7 +778,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       bool isWasmCapiFunction =
           linkage()->GetIncomingDescriptor()->IsWasmCapiFunction();
       // from start_call to return address.
-      int offset = __ root_array_available() ? 68 : 80;
+      int offset = __ root_array_available() ? 64 : 88;
 #endif  // V8_ENABLE_WEBASSEMBLY
 #if V8_HOST_ARCH_MIPS
       if (FLAG_debug_code) {

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

@@ -743,7 +743,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       bool isWasmCapiFunction =
           linkage()->GetIncomingDescriptor()->IsWasmCapiFunction();
       // from start_call to return address.
-      int offset = __ root_array_available() ? 76 : 88;
+      int offset = __ root_array_available() ? 64 : 112;
 #endif  // V8_ENABLE_WEBASSEMBLY
 #if V8_HOST_ARCH_MIPS64
       if (FLAG_debug_code) {