Move flags passed in rust_flags near the end of the rustc invocation.#4135
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This allows callers of rustc_compile_action to override the default flags. The motivating example for making this change was some path remapping done by Crubit (https://github.com/google/crubit/blob/main/rs_bindings_from_cc/bazel_support/compile_rust.bzl#L100). PR bazelbuild#4106 added another `--remap-path-prefix` flag after the code that adds `rust_flags` to the rustc invocation, and the new remapping took precedence.
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This allows callers of rustc_compile_action to override the default flags.
The motivating example for making this change was some path remapping done by Crubit (https://github.com/google/crubit/blob/685a46aabbdf6552803c5bd77da6628008d0d245/rs_bindings_from_cc/bazel_support/compile_rust.bzl#L100). PR #4106 added another
--remap-path-prefixflag after the code that addsrust_flagsto the rustc invocation, and the new remapping took precedence.