Add support for OpIsInf, OpIsNan

Bug: b/126873455
Change-Id: I5cac6eedf2d17bed6f01275e6d80cf8227886a8e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26468
Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

src/Pipeline/SpirvShader.cpp

@@ -326,6 +326,8 @@ namespace sw
 			case spv::OpBitcast:
 			case spv::OpSelect:
 			case spv::OpExtInst:
+			case spv::OpIsInf:
+			case spv::OpIsNan:
 				// Instructions that yield an intermediate value
 			{
 				TypeID typeId = insn.word(1);
@@ -1003,6 +1005,8 @@ namespace sw
 			case spv::OpConvertSToF:
 			case spv::OpConvertUToF:
 			case spv::OpBitcast:
+			case spv::OpIsInf:
+			case spv::OpIsNan:
 				EmitUnaryOp(insn, routine);
 				break;
 
@@ -1418,6 +1422,12 @@ namespace sw
 			case spv::OpBitcast:
 				dst.emplace(i, val);
 				break;
+			case spv::OpIsInf:
+				dst.emplace(i, As<SIMD::Float>(IsInf(val)));
+				break;
+			case spv::OpIsNan:
+				dst.emplace(i, As<SIMD::Float>(IsNan(val)));
+				break;
 			default:
 				UNIMPLEMENTED("Unhandled unary operator %s", OpcodeName(insn.opcode()).c_str());
 			}