SpirvShader: Implement GLSLstd450Sqrt

Bug: b/126873455
Tests: dEQP-VK.glsl.builtin.precision.sqrt.*
Change-Id: Ia178618bb2777d9b58beef19d4e18767cc9a8f73
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28695
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

src/Pipeline/SpirvShader.cpp

diff --git a/src/Pipeline/SpirvShader.cpp b/src/Pipeline/SpirvShader.cpp
index 283a4e2..6180687 100644
--- a/src/Pipeline/SpirvShader.cpp
+++ b/src/Pipeline/SpirvShader.cpp
@@ -3450,7 +3450,11 @@
 		}
 		case GLSLstd450Sqrt:
 		{
-			UNIMPLEMENTED("GLSLstd450Sqrt");
+			auto val = GenericValue(this, routine, insn.word(5));
+			for (auto i = 0u; i < type.sizeInComponents; i++)
+			{
+				dst.move(i, Sqrt(val.Float(i)));
+			}
 			break;
 		}
 		case GLSLstd450InverseSqrt: