[PATCH] D61046: Fix compilation warnings when compiling with GCC 7.3

[Alexandre Ganea via Phabricator via cfe-commits]

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In D61046#1486850 <https://reviews.llvm.org/D61046#1486850>, @rnk wrote:

> The only remaining change I find questionable is the R600 backend change


creduce'd and reported here: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63477#c4 - it is still present with GCC 9.1


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