Initial implementation of v0 mangling · Rust-GCC/gccrs@401362e

some tests are not correct

(internal compiler error: in v0_inherent_or_trait_impl_path, at rust/backend/rust-mangle.cc:464)

(test for excess errors)

(internal compiler error: Segmentation fault)

(test for warnings, line 4)

at line 7 (test for warnings, line 6)

(test for excess errors)

(internal compiler error: in v0_inherent_or_trait_impl_path, at rust/backend/rust-mangle.cc:464)

(test for warnings, line 9)

(test for excess errors)

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