Portable Linux perf map formatting.

Linux perf expects hex literals without a leading 0x, while some
implementations of printf might prepend one when using the %p format
for pointers, leading to wrongly formatted JIT symbols maps.

Instead, use V8PRIxPTR format string and cast pointer to uintpr_t,
since we have control over the exact output format of integers.

LOG=N

Review URL: https://codereview.chromium.org/1885033005

Cr-Commit-Position: refs/heads/master@{#35571}

src/log.cc

@@ -284,9 +284,15 @@ void PerfBasicLogger::LogRecordedBuffer(AbstractCode* code, SharedFunctionInfo*,
     return;
   }
 
-  base::OS::FPrint(perf_output_handle_, "%p %x %.*s\n",
-                   code->instruction_start(), code->instruction_size(), length,
-                   name);
+  // Linux perf expects hex literals without a leading 0x, while some
+  // implementations of printf might prepend one when using the %p format
+  // for pointers, leading to wrongly formatted JIT symbols maps.
+  //
+  // Instead, we use V8PRIxPTR format string and cast pointer to uintpr_t,
+  // so that we have control over the exact output format.
+  base::OS::FPrint(perf_output_handle_, "%" V8PRIxPTR " %x %.*s\n",
+                   reinterpret_cast<uintptr_t>(code->instruction_start()),
+                   code->instruction_size(), length, name);
 }
 
 // Low-level logging support.