ProjectExplorer: Add support for new M16C architecture

This commit adds new ProjectExplorer::Abi::M16CArchitecture
entry for the Renesas M16C architecture:

 * https://www.renesas.com/us/en/products/microcontrollers-microprocessors/m16c.html

Change-Id: Id476cfefbfd971b31cb307d51b6980a29684191d
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/abi.cpp

@@ -771,6 +771,8 @@ QString Abi::toString(const Architecture &a)
         return QLatin1String("m68k");
     case M32CArchitecture:
         return QLatin1String("m32c");
+    case M16CArchitecture:
+        return QLatin1String("m16c");
     case RiscVArchitecture:
         return QLatin1String("riscv");
     case UnknownArchitecture:
@@ -933,6 +935,8 @@ Abi::Architecture Abi::architectureFromString(const QStringRef &a)
         return M68KArchitecture;
     if (a == "m32c")
         return M32CArchitecture;
+    if (a == "m16c")
+        return M16CArchitecture;
     if (a == "riscv")
         return RiscVArchitecture;
     else if (a == "xtensa")

src/plugins/projectexplorer/abi.h

@@ -71,6 +71,7 @@ public:
         K78Architecture,
         M68KArchitecture,
         M32CArchitecture,
+        M16CArchitecture,
         RiscVArchitecture,
         UnknownArchitecture
     };