Add constants for all ELF dynamic flags (pertaining to DT_FLAGS_1). This will help, for example, determining whether an object is a position-independent executable (PIE). The constants are defined according to Table 15-10 in https://docs.oracle.com/en/operating-systems/solaris/oracle-solaris/11.4/linkers-libraries/dynamic-section.html.
Fixes #56887
Change-Id: I6cd501af50d9dbcc2aa8a9a002e12c6fb6726761
Reviewed-on: https://go-review.googlesource.com/c/go/+/452496 Reviewed-by: Ian Lance Taylor <iant@google.com>
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