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shader: fix conversion for return type of various bit operations

Gert Wollny requested to merge gerddie/virglrenderer:fix-bitop-sign into master

findLSB, findMSB, and countBits always return a signed integer

Fixes:

  • dEQP-GLES31.functional.shaders.builtin_functions.uniform.findLSBMinusOne.*
  • dEQP-GLES31.functional.shaders.builtin_functions.integer.findmsb.*
  • dEQP-GLES31.functional.shaders.builtin_functions.integer.bitcount.*

Signed-off-by: Gert Wollny gert.wollny@collabora.com

Edited by Jakob Bornecrantz

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