[MacPorts] #59253: libgcc9/gcc9: build fails with clang-9.0 during build of gencondmd: Undefined symbols for architecture x86_64: "ix86_binary_operator_ok(rtx_code, machine_mode, rtx_def**)"

[MacPorts]

#59253: libgcc9/gcc9: build fails with clang-9.0 during build of gencondmd:
Undefined symbols for architecture x86_64:
"ix86_binary_operator_ok(rtx_code, machine_mode, rtx_def**)"
--------------------+--------------------------
 Reporter:  kencu   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libgcc9 gcc9
--------------------+--------------------------
 During the build of gcc9 with `clang-9.0`, the build fails with the
 error(s) as above.

 Building `gcc9` with `clang-8.0` succeeds, but there are many warnings at
 the same point in the build.

 Obviously will need to be reported upstream, but in the meantime, building
 `gcc9` with `clang-9.0` is **no bueno**.

 I don't know yet about gcc 8,7,6,5, or 4

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Ticket URL: <https://trac.macports.org/ticket/59253>
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