MIPS: Fixing CLANG compilation warnings

Fixing warnings which cause compilation to fail when compiling
using CLANG for MIPS

BUG=

Review URL: https://codereview.chromium.org/1493793002

Cr-Commit-Position: refs/heads/master@{#32619}

src/mips64/cpu-mips64.cc

@@ -35,7 +35,7 @@ void CpuFeatures::FlushICache(void* start, size_t size) {
   cacheflush(
     reinterpret_cast<intptr_t>(start), reinterpret_cast<intptr_t>(end), 0);
 #else  // ANDROID
-  int res;
+  long res;  // NOLINT(runtime/int)
   // See http://www.linux-mips.org/wiki/Cacheflush_Syscall.
   res = syscall(__NR_cacheflush, start, size, ICACHE);
   if (res) {

test/cctest/test-assembler-mips64.cc

@@ -4626,7 +4626,7 @@ uint64_t run_align(uint64_t rs_value, uint64_t rt_value, uint8_t bp) {
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
 
-  F2 f = FUNCTION_CAST<F2>(code->entry());
+  F4 f = FUNCTION_CAST<F4>(code->entry());
 
   uint64_t res = reinterpret_cast<uint64_t>(
       CALL_GENERATED_CODE(isolate, f, rs_value, rt_value, 0, 0, 0));
@@ -5717,7 +5717,7 @@ uint64_t run_dsll(uint64_t rt_value, uint16_t sa_value) {
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
 
-  F2 f = FUNCTION_CAST<F2>(code->entry());
+  F4 f = FUNCTION_CAST<F4>(code->entry());
 
   uint64_t res = reinterpret_cast<uint64_t>(
       CALL_GENERATED_CODE(isolate, f, rt_value, 0, 0, 0, 0));