[clang] [clang][CodeGen] Zero init unspecified fields in initializers in C (PR #97121)

[Eli Friedman via cfe-commits]

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@@ -5819,3 +5819,24 @@ specify the starting offset to begin embedding from. The resources is treated
 as being empty if the specified offset is larger than the number of bytes in
 the resource. The offset will be applied *before* any ``limit`` parameters are
 applied.
+
+Union and aggregate initialization in C
+=======================================
+
+In C23 (N2900), when an object is initialized from initializer ``= {}``, all
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efriedma-quic wrote:

Probably should explicitly mention we don't do this in C++.

https://github.com/llvm/llvm-project/pull/97121