hg: jdk/submit11: 8207355: C1 compilation hangs in ComputeLinearScanOrder::compute_dominator

[tobias.hartmann at oracle.com]

Changeset: f646ca47e561
Author:    thartmann
Date:      2018-08-06 09:09 +0200
URL:       http://hg.openjdk.java.net/jdk/submit11/rev/f646ca47e561

8207355: C1 compilation hangs in ComputeLinearScanOrder::compute_dominator
Summary: Bail out from recursive computation if the block was already processed.
Reviewed-by: kvn, iveresov

! src/hotspot/share/c1/c1_IR.cpp
+ test/hotspot/jtreg/compiler/c1/TestLinearScanOrder.jasm
+ test/hotspot/jtreg/compiler/c1/TestLinearScanOrderMain.java