vc4: Don't bother zero-initializing the shader reloc indices.
vc4: Don't bother zero-initializing the shader reloc indices.

They should all be set to real values by the time they're read, and
ideally if you used valgrind you'd see uninitialized value uses.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler