Add support for vector types and vector constants.

tests_lit/llvm2ice_tests/vector-pool.ll

+; This file tests support for vector constant pooling.
+
+; RUN: %llvm2ice -O2 --verbose none %s | FileCheck %s
+; RUN: %llvm2ice -Om1 --verbose none %s | FileCheck %s
+; RUN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
+; RUN: %llvm2iceinsts %s | %szdiff %s | FileCheck --check-prefix=DUMP %s
+
+define <4 x float> @test_v4f32(i32 %arg) {
+entry:
+  ret <4 x float> <float 4.000000e+00, float 3.000000e+00, float 2.000000e+00, float 1.000000e+00>
+}
+
+; CHECK:      .long 0x40800000
+; CHECK-NEXT: .long 0x40400000
+; CHECK-NEXT: .long 0x40000000
+; CHECK-NEXT: .long 0x3f800000
+
+define <8 x i1> @test_v4i1(i32 %arg) {
+entry:
+  ret <8 x i1> <i1 0, i1 1, i1 0, i1 1, i1 1, i1 1, i1 1, i1 1>
+}
+
+; CHECK:      .short 0x0
+; CHECK-NEXT: .short 0x1
+; CHECK-NEXT: .short 0x0
+; CHECK-NEXT: .short 0x1
+; CHECK-NEXT: .short 0x1
+; CHECK-NEXT: .short 0x1
+; CHECK-NEXT: .short 0x1
+; CHECK-NEXT: .short 0x1
+
+; ERRORS-NOT: ICE translation error
+; DUMP-NOT: SZ