Prevent kMaxHeapSize overflow on 32-bit debug builds.

Uses uint64_t instead of size_t in isPowerOfTwo checks.

BUG=dawn:27

Change-Id: If8bcdcd855d10fd2dc1f42fa18e3defab13a76b0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12500
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

src/common/Math.cpp

@@ -74,7 +74,7 @@ uint64_t NextPowerOfTwo(uint64_t n) {
 #endif
 }
 
-bool IsPowerOfTwo(size_t n) {
+bool IsPowerOfTwo(uint64_t n) {
     ASSERT(n != 0);
     return (n & (n - 1)) == 0;
 }

src/common/Math.h

@@ -26,7 +26,7 @@
 uint32_t ScanForward(uint32_t bits);
 uint32_t Log2(uint32_t value);
 uint32_t Log2(uint64_t value);
-bool IsPowerOfTwo(size_t n);
+bool IsPowerOfTwo(uint64_t n);
 
 uint64_t NextPowerOfTwo(uint64_t n);
 bool IsPtrAligned(const void* ptr, size_t alignment);