Add new Intel 18 and 19 bug test case

Author: nncarlson

intel-bugs/CMakeLists.txt

@@ -5,6 +5,7 @@ include(testing)
 
 project(intel-bugs Fortran)
 
+add_compiler_test(SOURCES intel-20191228.f90)
 add_compiler_test(SOURCES intel-20190909.f90 COMPILE_ONLY)
 add_compiler_test(SOURCES intel-20190903b.f90 COMPILE_ONLY)
 add_compiler_test(SOURCES intel-20190903.f90 COMPILE_ONLY)

intel-bugs/intel-20191228.f90

@@ -0,0 +1,17 @@
+!! INTERNAL COMPILER ERROR
+!!
+!! Affects both 18.0.5 and 19.0.5. No error if string is not allocatable.
+!!
+!! $ ifort --version
+!! ifort (IFORT) 19.0.5.281 20190815
+!! 
+!! $ ifort intel-20191228.f90 
+!! intel-20191228.f90(4): catastrophic error: **Internal compiler error: internal abort** Please report this error along with the circumstances in which it occurred in a Software Problem Report.  Note: File and line given may not be explicit cause of this error.
+!! compilation aborted for intel-20191228.f90 (code 1)
+
+character(:), allocatable :: string
+string = 'fubar'
+associate (substring => string(3:))
+  if (substring /= 'bar') stop 1
+end associate
+end