Add call instructions to Subzero's bitcode reader.

tests_lit/reader_tests/call-indirect.ll

+; Test parsing indirect calls in Subzero.
+
+; RUN: llvm-as < %s | pnacl-freeze -allow-local-symbol-tables \
+; RUN:              | %llvm2ice -notranslate -verbose=inst -build-on-read \
+; RUN:                -allow-pnacl-reader-error-recovery \
+; RUN:                -allow-local-symbol-tables \
+; RUN:              | FileCheck %s
+
+define internal void @CallIndirectVoid(i32 %f_addr) {
+entry:
+  %f = inttoptr i32 %f_addr to void ()*
+  call void %f()
+  ret void
+}
+
+; CHECK:      define internal void @CallIndirectVoid(i32 %f_addr) {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   call void %f_addr()
+; CHECK-NEXT:   ret void
+; CHECK-NEXT: }
+
+define internal i32 @CallIndirectI32(i32 %f_addr) {
+entry:
+  %f = inttoptr i32 %f_addr to i32(i8, i1)*
+  %r = call i32 %f(i8 1, i1 false)
+  ret i32 %r
+}
+
+; CHECK-NEXT: define internal i32 @CallIndirectI32(i32 %f_addr) {
+; CHECK-NEXT: entry:
+; CHECK-NEXT:   %r = call i32 %f_addr(i8 1, i1 false)
+; CHECK-NEXT:   ret i32 %r
+; CHECK-NEXT: }