Allow passing -nostdlib to clang linker driver
#1547
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Embedded targets may need `-nostdlib` passed to `clang` linker driver in certain situations, see #1534 for more details. Currently, `swiftc` doesn't recognize `-nostdlib` at all, while `-Xlinker -nostdlib` passed to a `swiftc` link job from the build system will be passed verbatim to the linker and not recognized by the linker driver. We should support this flag in `swiftc` to fix this.
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Embedded targets may need
-nostdlibpassed toclanglinker driver in certain situations, see #1534 for more details.Currently,
swiftcdoesn't recognize-nostdlibat all, while-Xlinker -nostdlibpassed to aswiftclink job from the build system will be passed verbatim to the linker and not recognized by the linker driver. We should support this flag inswiftcto fix this.