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svn:author
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jbeich
K 8
svn:date
V 27
2020-11-20T12:37:54.738781Z
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svn:log
V 333
MFH: r555015

gecko: bump LLVM_DEFAULT to 11

Detach from tree-wide default as coordinating with other maintainers
is expensive for little gain. User's choice is still respected.

llvm11 has better Tier2 support, more optimizations, reduces package size
and aligns with what contributors dogfood.

Approved by:	ports-secteam blanket

END