[Clang][FMV] Stop emitting implicit default version using target_clones. (#141808)

With the current behavior the following example yields a linker error:
"multiple definition of `foo.default'"

// Translation Unit 1
__attribute__((target_clones("dotprod, sve"))) int foo(void) { return 1; }

// Translation Unit 2
int foo(void) { return 0; }
__attribute__((target_version("dotprod"))) int foo(void);
__attribute__((target_version("sve"))) int foo(void);
int bar(void) { return foo(); }

That is because foo.default is generated twice. As a user I don't find
this particularly intuitive. If I wanted the default to be generated in
TU1 I'd rather write target_clones("dotprod, sve", "default")
explicitly.

When changing the code I noticed that the RISC-V target defers the
resolver emission when encountering a target_version definition. This
seems accidental since it only makes sense for AArch64, where we only
emit a resolver once we've processed the entire TU, and only if the
default version is present. I've changed this so that RISC-V immediately
emmits the resolver. I adjusted the codegen tests since the functions
now appear in a different order.

Implements https://github.com/ARM-software/acle/pull/377

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