8939cef951
We were scanning only function literals with closures, but not all function literals have closures. Discovered because compiler failed building 1.15rc1, as there is a function literal in the runtime package (p1 in hexdumpWords) that has no closure and, without escape analysis, was forcing a variable to the heap which is not permitted in the runtime. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/244802
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