Merge pull request #3011 from cfallin/bint-x64

Fix `bint` on x64, and make `bextend` consistent with bool representation.

cranelift/filetests/filetests/runtests/bint.clif

@@ -0,0 +1,37 @@
+test run
+target aarch64
+target x86_64 machinst
+
+function %bint_b8_i16_true() -> i16 {
+block0:
+  v0 = bconst.b8 true
+  v1 = bint.i16 v0
+  return v1
+}
+; run: %bint_b8_i16_true() == 1
+
+
+function %bint_b16_i16_true() -> i16 {
+block0:
+  v0 = bconst.b16 true
+  v1 = bint.i16 v0
+  return v1
+}
+; run: %bint_b16_i16_true() == 1
+
+function %bint_b8_i16_false() -> i16 {
+block0:
+  v0 = bconst.b8 false
+  v1 = bint.i16 v0
+  return v1
+}
+; run: %bint_b8_i16_false() == 0
+
+
+function %bint_b16_i16_false() -> i16 {
+block0:
+  v0 = bconst.b16 false
+  v1 = bint.i16 v0
+  return v1
+}
+; run: %bint_b16_i16_false() == 0

cranelift/filetests/filetests/runtests/i128-bint.clif

@@ -0,0 +1,11 @@
+test run
+target x86_64 machinst
+
+function %bint_b8_i128() -> i64, i64 {
+block0:
+  v0 = bconst.b8 true
+  v1 = bint.i128 v0
+  v2, v3 = isplit.i128 v1
+  return v2, v3
+}
+; run: %bint_b8_i128() == [1, 0]