[CIR] Add constant record ILE support (#155663) This patch adds basic support for constant record initializer list expressions. There's a couple of limitations: * No zero initialized padding bytes in C mode * No bitfields * No designated initializer lists * Record alignments are not calculated, yet * ILEs of derived records don't work, yet * The constant attribute is not propagated to the backend, resulting in non-constants being emitted in the LLVM IR
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