radeon/llvm: Use the llvm.rsq.clamped intrinsic for RSQ

Reviewed-and-Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Tested-by: Laurent Carlier <lordheavym@gmail.com>

https://bugs.freedesktop.org/show_bug.cgi?id=80015

CC: "10.1 10.2" <mesa-stable@lists.freedesktop.org>

src/gallium/drivers/radeon/radeon_setup_tgsi_llvm.c

@@ -1385,7 +1385,7 @@ void radeon_llvm_context_init(struct radeon_llvm_context * ctx)
 
 	bld_base->rsq_action.emit = build_tgsi_intrinsic_nomem;
 #if HAVE_LLVM >= 0x0305
-	bld_base->rsq_action.intr_name = "llvm.AMDGPU.rsq.";
+	bld_base->rsq_action.intr_name = "llvm.AMDGPU.rsq.clamped.f32";
 #else
 	bld_base->rsq_action.intr_name = "llvm.AMDGPU.rsq";
 #endif