Cranelift: ensure ISA level needed for SIMD is present when SIMD is enabled. (#3816)

Addresses #3809: when we are asked to create a Cranelift backend with
shared flags that indicate support for SIMD, we should check that the
ISA level needed for our SIMD lowerings is present.

cranelift/filetests/filetests/isa/x64/simd-lane-access-compile.clif

@@ -1,6 +1,6 @@
 test compile precise-output
 set enable_simd
-target x86_64 has_ssse3 has_sse41
+target x86_64 has_sse3 has_ssse3 has_sse41
 
 ;; shuffle