RefCountedObject: fix allocation for overaligned type #4132

Job	Run time
Linux -> Pre-checks	16s
Linux -> Clang-NO_GLSLANG-x64, Debug	6m 39s
Linux -> GCC-x64, Debug	11m 38s
Linux -> Clang-x64, Debug	7m 45s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	4m 28s
Linux -> GCC-x64, Release	9m 58s
Linux -> Clang-x64, Release	7m 43s
	48m 27s

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