target/arm: Don't read r4 from v8M exception stackframe twice
A cut-and-paste error meant we were reading r4 from the v8M callee-saves exception stack frame twice. This is harmless since it just meant we did two memory accesses to the same location, but it's unnecessary. Delete it. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Message-id: 20181002150304.2287-1-peter.maydell@linaro.org
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