[NFC][Clang] Add driver tests for sb and predres

[dnsampaio]

Summary

Add tests that arguments for enabling/disabling sb and predres are correctly being or not passed by the driver.

[pbarrio]

Same idea as https://reviews.llvm.org/D54961 but for two other command line options. Approved!

test/Driver/aarch64-predres.c

+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8a+predres     %s 2>&1 | FileCheck %s
+// CHECK: "-target-feature" "+predres"
+// CHECK-NOT: "-target-feature" "-predres"
+
+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8.5a+nopredres %s 2>&1 | FileCheck %s --check-prefix=NOPR
+// NOPR: "-target-feature" "-predres"
+// NOPR-NOT: "-target-feature" "+predres"
+
+// RUN: %clang -### -target aarch64-none-none-eabi                           %s 2>&1 | FileCheck %s --check-prefix=ABSENT
+// ABSENT-NOT: "-target-feature" "+predres"
+// ABSENT-NOT: "-target-feature" "-predres"

test/Driver/arm-sb.c

+// RUN: %clang -### -target arm-none-none-eabi -march=armv8a+sb %s 2>&1 | FileCheck %s
+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8a+sb %s 2>&1 | FileCheck %s
+// CHECK: "-target-feature" "+sb"
+// CHECK-NOT: "-target-feature" "-sb"
+
+// RUN: %clang -### -target arm-none-none-eabi -march=armv8.5a+nosb %s 2>&1 | FileCheck %s --check-prefix=NOSB
+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8.5a+nosb %s 2>&1 | FileCheck %s --check-prefix=NOSB
+// NOSB: "-target-feature" "-sb"
+// NOSB-NOT: "-target-feature" "+sb"
+
+// RUN: %clang -### -target arm-none-none-eabi %s 2>&1 | FileCheck %s --check-prefix=ABSENT
+// RUN: %clang -### -target aarch64-none-none-eabi %s 2>&1 | FileCheck %s --check-prefix=ABSENT
+// ABSENT-NOT: "-target-feature" "+sb"
+// ABSENT-NOT: "-target-feature" "-sb"