8170326: Inconsistencies between code, compiler.properties and comments
Summary: Converting uses of Log and JCDiagnostic.Factory methods to use CompilerProperties instead of plain Strings, fixing inconsistencies, adding crules analyzer to ensure CompilerProperties are used whenever possible.
Reviewed-by: mcimadamore

8176743: tools/javac/modules/MOptionTest.java test fails on Mac
Summary: Correctly preferring classfiles over source files when timestamps match.
Reviewed-by: jjg

8175057: module-info on patch path should not produce an error
Summary: Allowing module-infos on patch paths during compilation.
Reviewed-by: jjg, ksrini

8173777: Merge javac -Xmodule into javac--patch-module
Summary: Merging -Xmodule: functionality into --patch-module.
Reviewed-by: jjg, mchung, rfield

8163190: Clarify JavaFileManager use of \"module location\"
Reviewed-by: jlahoda

8152911: javac assertion error when compiling overlay sources
Summary: Avoid creating ModuleSymbols with unspecified name, to avoid conflicts with predefined ModuleSymbol for the java.base module.
Reviewed-by: jjg

8142968: Module System implementation
Summary: Initial integration of JEP 200, JEP 260, JEP 261, and JEP 282
Reviewed-by: jjg, jlahoda, vromero, mcimadamore, bpatel, ksrini, darcy, anazarov, dfuchs
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, jan.lahoda@oracle.com, vicente.romero@oracle.com, andreas.lundblad@oracle.com, andrey.x.nazarov@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, kumar.x.srinivasan@oracle.com, sundararajan.athijegannathan@oracle.com