BareMetal: Auto-detect IAR toolchain for Renesas V850 architecture

This patch implements auto-detection for the V850 toolchain,
provided by IAR Systems:

 * https://www.iar.com/iar-embedded-workbench/#!?architecture=V850

Change-Id: I89c2b2ab87f0b32af4e25e77b8a3b6381481c4cc
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/abi.cpp

@@ -725,6 +725,8 @@ QString Abi::toString(const Architecture &a)
         return QLatin1String("rl78");
     case C166Architecture:
         return QLatin1String("c166");
+    case V850Architecture:
+        return QLatin1String("v850");
     case UnknownArchitecture:
         Q_FALLTHROUGH();
     default:
@@ -871,6 +873,8 @@ Abi::Architecture Abi::architectureFromString(const QStringRef &a)
         return Rl78Architecture;
     if (a == "c166")
         return C166Architecture;
+    if (a == "v850")
+        return V850Architecture;
     else if (a == "xtensa")
         return XtensaArchitecture;
     if (a == "asmjs")