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5d0e26e571
On 64-bit platforms, libgcc doesn't ship with __clzsi2, so __builtin_clz
gets lowered to __clzdi2. A check already exists for GCC, but as of
commit 8210ca0198 clang also lowers
__builtin_clz to __clzdi2 on sparc64.
Update the check so that building __clzdi2 with clang/sparc64 also
works.